Discharge for grinding mills



Nov. 24 1925. 1,562,792

J. P. RUTH, JR

DISCHARGE FOR GRINDING MILLS Filed June 12. 1923 Patented Nov. 24, 1925.

JOSEPH P. RUTH, JR., 013 DENVER. COLORADO.

DISCHARGE FOR GRINDING MILLS.

Application filed June 12, 1922.

To all whom it may concern.

Be it known that I, Josnrrr P. RUTH, J12, a citizen of the UnitedStates, and resident of the city and county of Denver, State ofColorado, have invented certain new and, useful Improvements inDischarges for Grinding Mills; and I do declare the following to ie afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, which form apart of this specification.

The object of this invention is to provide a novel and efiicient door orclosure for dis charge heads of grinding mills which may be held rigidlyin position and will efl'ectually prevent splashing and slopping of thepulp being discharged.

The invention comprises a closure which may have at its center anaperture for in spection of the interior of the mill and has at its backa protecting liner. Said closure also has an annular sleeve or drum,which may be cylindrical and is spaced from the dischar 'e head by aspiral feed-screw carried by the outer walls of the sleeve and engagingthe inner or discharge walls of the head. This feed screw prevents thepulp from passing from the mill in a direct line, causing it to travel aspiral path before passing over the discharge flange of the head. Thusthe pulp is fed positively from the mill and at the same time splashingis prevented.

In the accompanying drawings wherein certain embodiments of theinvention are disclosed by way of illustration,

Fig. 1 is an axial section through the discharge head of a mill providedwith one form of closure of the present invention;

Fig. 2 is an outer end view thereof, the head being omitted;

Fig. 3 is a side elevation of the closure per se;

Fig. 4 is an axial section showing a slight modification Fig. 5 is anaxial section ther modification.

The drawings disclose a discharge head of a mill 12, said head having adischarge throat 14 which may be a journal for the mill and carries anouter discharge flange 15. The door or closure 16 of the presentinvention preferably is provided at its center with an opening .1 hreughwhich the in showing a tnr- Serial No. 6441,8512.

terior of the mill may be viewed. At the periphery said closure isprovided with a preferably integral drum or sleeve 20 upon whose outersurface feed screws 22 are spirally arranged and are overlapped at leastenough to prevent flow of pulp directly from the mill and cause the sameto travel a spiral path. As shown three screw sections 22 are employedand each extends approximately half way around the drum 20. Thisconstruction positively feeds the pulp from the mill and preventssplashing. A liner 24 bolted to the rear of the closure 16 protects thelatter from the balls or rods used in the mill. In the form of Figs. 1,2 and 3, ears 25 on the outer end of the drum 20 are secured by bolts orscrews 26 to lugs or bosses 28 integral with the flange 15. Thus theclosure is held in position with the edges of the screw sections 22 infirm engagement with the inner discharge walls of the throat 141:. Ifthe lugs 28 extend inward toward the axis of the mill, the closure maybe readily placed or withdrawn by slight rotation of the closure tocause the feed screws 22 to clear said lugs.

In the form of Fig. 5, a frusto-conical flange 3O integral with the drum20 is substi tuted for the cars 25, the diameter of this flange beinggreater than the external diameter of the screws 22 and the internaldiameter of the throat 14 engaged by said screws. The ends of feedscrews 22 extend to and along the flange 30 and engage with the flange15. Screws 32 are passed through the flange 30 and into lugs 3 1 on theflange 15 01": the mill head, lugs 34 being low enough to avoidinterference with teed screws 22 when the closure is being placed orremoved.

In Fig. 4-, the inner wall of the closure liner 12 1 is frusto-conicalin shape to aline with the inner wall of the mill head 10, and the. ends122 of the feed screws 22 are correspondingly inclined. The transverseportion 16 of the closure may also be frustoconical if desired, asshown. Spaced lugs may be cast on the inner walls of the throat 14: toreceive screws 42 passed through the drum 20 and retained by lock nuts14-. The closure may be rotated to clear the lugs 40 when beingposition-ed or removed.

Thus in all the forms splashing is eliminated or reduced materially,while in the form of Fig. 5, where the pulp flows out between thefrusto-conical flanges 15 and 30, splashing from any influences withinthe mill is entirely prevented, at least so far as concerns thedischarged pulp.

I claim:

1. In combination, a head for grinding mills having a discharge throatprovided with an inner wall and a closure mounted in said throat, saidclosure comprising a transverse wall, a sleeve at the periphery of saidwall spaced from the inner wall of the throat and having an outer wall,and a spiral feed screw carried by the outer wall of the sleeve andengaging the inner wall of the throat.

2. In combination, a head for grinding mills having a discharge throat,a closure mounted in said throat having a transverse wall, a liner onthe inner face-of said wall,

an annular member carried by said walll and spaced from the walls of thethroat, and a spiral feed screw between said member and the walls ofthethroat.

3. In combination, a head for grinding mills having a discharge throatprovided with an inner wall, a removable closure mounted in the throathaving a transverse wall and sleeve at the periphery of said wall spacedfrom the inner wall of the throat, a feed screw mounted on the sleevebetween. the sleeve and said inner wall, and a frusto-conical flange onthe outer end of said sleeve of greater diameter than the internaldiameter of the throat.

In testimony whereof I affix my signature.

JOSEPH P. RUTH, JR.

